Spring-binder for loose sheets.



R. KRUMMING.

SPRING'BINDER FOB. LOOSE SHEETS. v

APPLIOATION FILED MAY 26, 1910.

1,058,871 Patented Apr. 15, 1913.

REINI-IOLD KRUMMING, OF MILWAUKEE, WISCONSIN.

SPRING-BINDER FOR LOOSE SHEETS.

Application filed May 26, 1910. Serial No. 563,622.

Specification of Letters Patent.

Patented Apr. 15,1913.

To all whom it may concern Be it known that I, REINHOLD KRUMMING, ofMilwaukee, Wisconsin, have invented a Spring-Binder for Loose Sheets, ofwhich the following is a specification.

This invention relates to loose-leaf binders of that class which operatewith a spring to hold the loose leaves in the binder, and constructedwith two hinges, one a simple hinge to open the cover, and the other aspring-hinge to hold the leaves.

My invention has for its object to improve this class of devices byproviding a simpler, neater, cheaper and more etficient form ofspring-hinge than has been heretofore in use; and further to providemeans for limiting the degree of opening of the springhinge.

I further aim to provide novel means for enabling the front-cover to bequickly opened by the fingers.

My invention comprises the constructions and combinations which will behereafter described and more particularly pointed out in my claims.

The nature of my invention will best be understood from a considerationof the accompanying drawings, which show the most improved form thereof,taken in connection with the following detailed description.

In these drawings Figure 1 is a perspective view of a binder constructedaccording to my invention; Fig. 2 is a side-edge view thereof in closedposition; Fig. 3 is a similar view in position for removing or insertingleaves; Fig. 47 is a plan view thereof; Fig. 5 is a back-edge viewthereof with the spring removed; Fig. 6 is a transverse sectionthereofon the plane 6; and Fig. 7 is a perspective view of the springseparately.

.The binder as shown comprises a back-- plate a forming a back-cover5 afront-plate b forming a front-cover; a hinge-leaf 0, which haspintle-rolls (Z and 6 turned on the opposite edges thereof, interlockingwith corresponding pintle-rolls f and g on the plates at and brespectively; and two pintles h and 2' uniting the respectivepintle-rolls. The binder is completed with the addition of theplate-spring j, which is bent into a U- shape proper to embrace thepintle-rolls d and f and lie flat upon the faces of the members a and 0respectively, thus keeping the hinge-joint at z pressed constantlyagainst the back-cover a or upon any loose sheets 8 that may be includedbetween them.

In the form as shown in Fig. 1, the plane portion of the members a; andc are formed tangential to the hinge-rolls d and f, but in order toprevent the spring j from sliding off whenthe spring-hinge is opened, itis preferable to form a slight concavity is at the base of one or bothpintle-rolls, as shown in Figs. 2 and 3, the spring j being given acorresponding concavity m whereby it is prevented from sliding away fromthe back.

The manner of using the binder will be understood from Figs. 2 and 3,the cover 6 being merely turned upon the pintle i where it is onlydesired to write upon or inspect some of the leaves in the binder; butwhen it is desired to remove or insert some leaves, the cover 6 isturned back into the position shown in Fig. 3 and the spring-hinge priedopen against the force of the spring by using the pintle h as a fulcrum.In this operation a great strain is brought upon the cover-plate b atthe fulcrum, and unless it is of very stout metal it will yield more orless, thus causing the cover-plate to become curled or bent andpreventing it from shutting properly. In order to prevent this fromtaking place I may press ribs or grooves n in the cover-plate, thusstrengthening it without necessarily increasing the thickness of themetal, and as books of this class have to be manufactured and sold at avery small profit, it will be readily understood that this saving ofmetal is an important consideration to the manufacturer, as well as tothe user in the bulk and weight of the column which he has to carry.

As the spring-hinge is not intended to be opened to more than a limitedextent, and to prevent the binder from being extended beyond its propercapacity, I may provide stop-devices which are shown in Fig. 5 (they areomitted from Fig. 1) and consist in forming the pintle-rolls d and gwith interlocking shoulders 0 and p, which in the closed position of thehinges are separated from one another, but in the position of maximumopening come to an abutment and prevent any further opening. Thisfeature, however, is not essential to the operativeness of my inventionas a whole.

Another important feature, though a simple one, is the means which Iprovide to enable the book to be readily opened. As is well understoodby users, such books are usually carried with only a few leaves,consequently the edges of the covers come close together,

and as they are thin become diflicult to separate. To prevent this, theright-hand edge of the front-cover b is extended slightly beyond that ofthe back-cover, so that in handling one readily catches the front-coverWithout touching the back-cover; so that the book opens instantlywithout fumbling.

It will be seen that my form of springbinder consists of only threepieces besides the spring and pintles, consequently it is not only morecheaply made than others but is actually better in being lighter andhaving no protruding edges or wires which are apt to catch in theclothing or gather dust.

I do not Wish it understood that my invention is limited to the use ofall the above described features and constructions, for some may beomitted and others may be varied or modified in various ways, as willreadily occur to those skilled in the art.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A spring-binder comprising a backcover, a front-cover, and ahinge-leaf united by hinge joints to one edge of each of said covers andmeans for resiliently pressing said hinge-leaf toward said back-cover,said front-cover when closed having its free edge projecting throughoutits entire length beyond the free edge of said back-cover, whereby itmay be readily apprehended by the fingers and separated from saidbackcover.

2. A spring-binder comprising, in combination, an integral metal plateforming a back-cover and having a pintle-roll turned at one edge, ahinge-leaf having a corresponding interlocking pintle-roll turned on oneedge, a pintle uniting said pintle-rolls, a U-shaped plate-springembracing said pintle-rolls and exerting a closing pressure upon thejoint, said hinge-leaf having further a pintle-roll turned on its otheredge, a frontcover having a pintle-roll corresponding to andinterlocking with said last-named pintle-roll, and a second pintleuniting said last two named pintle-rolls; said front-cover when closedhaving its free edge extending for the entire width of the cover beyondthe corresponding edge of the back cover.

3. A spring binder comprising a nonfiexible front cover, a back coverand a double hinge connection between the same at .one edge, said hingehaving an intermediate leaf portion of rigid nature to prevent forwardand back movement of the covers one upon the other, the front cover whenclosed having its front edge extended throughout its entire width beyondthe front edge of the back cover as and for the purpose specified.

4. A spring binder comprising a nonflexible front cover, a non-flexibleback cover, and a double hinge connection between the same at adjacentedges of said covers, the intermediate leaf portion of said hinge beingof rigid nature to prevent forward and back movement of the covers oneupon the other and being spring pressed, the front cover having itsfront edge extended throughout its entire width beyond the front edge ofthe back cover and when closed disposed with such edge projecting.

5. In a binder or holder for sheets or pads, the combination of the backand front covers having knuckles on their rear ends; a clamp memberhaving knuckles on its rear edge coacting with the knuckles of said backcover and knuckles on said front cover; pintles for said knuckles, thefront cover being arranged so that its front end projects beyond andoverlaps the front end of the back cover for the entire length of suchends when the covers are closed to facilitate the grasping of said frontcover; and a tension spring for said clamp member.

In witness whereof I have hereunto set my hand this twenty-eighth day ofApril, 1910.

REINHOLD KRUMMING.

Vitnesses EMIL J. ZINGEN, GEORGE NETZ.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

